ID. 264 – Validation of the SCEC broadband platform simulations for bridge seismic demand assessment

J. Oreb, M. S. Novak, N. Bijelić

For many seismically endangered locations, there is a limited database of recorded high-intensity earthquake ground motions. On the other hand, extreme earthquake events can be characterized by numerical earthquake simulations. With the goal of developing trust in the utilization of simulated earthquake motions for engineering applications, this paper focuses on ‘similar intensity measure’ validation of simulated motions for demand assessment of a reinforced concrete bridge. Separate sets of comparable recorded and simulated ground motions are selected following the generalized conditional intensity measure approach whereby conditional spectrum and significant durations are used as hazard targets. Seismic demands from comparable sets of recorded and simulated motions are estimated at several intensities while the collapse capacities are obtained by using an incremental dynamic analysis (IDA). A statistical comparison of the results investigates whether there are significant differences between the responses. Considered engineering demand parameters include maximum lateral displacement, column drift ratio, and the bending moment and shear force at the bottom of the column. No statistically significant differences between the responses to recorded and simulated motions were observed in the elastic domain, while at higher intensities there are larger discrepancies between the results, but still without statistically significant differences. The results suggest that simulated seismograms and the SCEC BBP can be used as a useful tool for structural design. Opportunities for future work are discussed.

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